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3MDBench: Medical Multimodal Multi-agent Dialogue Benchmark

Though Large Vision-Language Models (LVLMs) are being actively explored in medicine, their ability to conduct telemedicine consultations combining accurate diagnosis with professional dialogue remains underexplored. In this paper, we present 3MDBench (Medical Multimodal Multi-agent Dialogue Benchmark), an open-source framework for simulating and evaluating LVLM-driven telemedical consultations. 3MDBench simulates patient variability through four temperament-based Patient Agents and an Assessor Agent that jointly evaluate diagnostic accuracy and dialogue quality. It includes 3013 cases across 34 diagnoses drawn from real-world telemedicine interactions, combining textual and image-based data. The experimental study compares diagnostic strategies for popular LVLMs, including GPT-4o-mini, LLaVA-3.2-11B-Vision-Instruct, and Qwen2-VL-7B-Instruct. We demonstrate that multimodal dialogue with internal reasoning improves F1 score by 6.5% over non-dialogue settings, highlighting the importance of context-aware, information-seeking questioning. Moreover, injecting predictions from a diagnostic convolutional network into the LVLM's context boosts F1 by up to 20%. Source code is available at https://anonymous.4open.science/r/3mdbench_acl-0511.

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